Hello.
The Black 1+2 and White 1+2 Games are working in DS Mode.
You can also use TWiLight on a supported Flashcart with Memory Expansion Pack on the DS Lite (better Performance).
The Games are working without DSi "Gimmicks".
If you "want" to play online,what "holds you back" to get an original Pokémon Gamecart ?
Thank you.